Bad service from Momentum

I Recieved a call last year from Momentum stating that my Life insurance cover policy has been cancelled due to non payment.<br> <br> I have rep**** in several mails to them stating that i have in fact paid all premiums and have all the proof of payment which i have sent through on mail.<br> <br> When i phoned again this morning trying to find out whats going on, i was told that my policy has been cancelled in September last year. i have been making payments each month and have the proof of payments as proof.<br> <br> How can they just cancel my policy, and not reply to anything i request as to why they did that.<br> <br> Very unprofessional, So i would like to escalate this to management to find out what is the situation and how do i reinstate my life insurance cover. Phoning through call centre is just a waste of time